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1. (WO2013118559) FOCUS ADJUSTMENT DEVICE, CAMERA SYSTEM AND FOCUS ADJUSTMENT METHOD

Pub. No.:    WO/2013/118559    International Application No.:    PCT/JP2013/050900
Publication Date: Fri Aug 16 01:59:59 CEST 2013 International Filing Date: Sat Jan 19 00:59:59 CET 2013
IPC: G02B 7/28
G02B 7/36
G03B 13/36
G03B 15/00
H04N 5/232
Applicants: OLYMPUS IMAGING CORP.
オリンパスイメージング株式会社
Inventors: KIKUCHI, Tetsuo
菊池 哲央
KINDAICHI, Takeshi
金田一 剛史
Title: FOCUS ADJUSTMENT DEVICE, CAMERA SYSTEM AND FOCUS ADJUSTMENT METHOD
Abstract:
The purpose of the invention is to improve the ability to track a moving body during continuous shooting and thereby allow for high-speed and accurate focus adjustment. A control unit of a camera body performs initial position driving for moving a focus lens with the driving amount and the driving direction for the initial position driving set to Li, on the basis of the magnitude of the speed of an object (the slope of an object movement profile (H)) detected by an object speed detection unit, so as to satisfy the relationship Lh < (Ls - Lps + Li), where Lh is the amount of image plane movement by the object, Ls is the scan driving range, Lps is the scan driving range required for detecting a peak, and Li is the initial position driving amount. Thereby, the object movement profile (H) and the scan driving amount profile (S) of a focus lens intersect in an interval (k4) where contrast autofocus is implemented. Thereafter, the control unit performs a scan driving operation in the interval (k4) and reliably detects a focus point regardless of the magnitude of the image plane moving speed of an object (the slope of the object movement profile (H)).